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diff --git a/source/blender/freestyle/intern/system/Iterator.h b/source/blender/freestyle/intern/system/Iterator.h
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+++ b/source/blender/freestyle/intern/system/Iterator.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2010 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __FREESTYLE_ITERATOR_H__
+#define __FREESTYLE_ITERATOR_H__
+
+/** \file blender/freestyle/intern/system/Iterator.h
+ *  \ingroup freestyle
+ */
+
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+class Iterator
+{
+public:
+	virtual ~Iterator() {}
+
+	virtual string getExactTypeName() const
+	{
+		return "Iterator";
+	}
+
+	virtual int increment()
+	{
+		cerr << "Warning: increment() not implemented" << endl;
+		return 0;
+	}
+
+	virtual int decrement()
+	{
+		cerr << "Warning: decrement() not implemented" << endl;
+		return 0;
+	}
+
+	virtual bool isBegin() const
+	{
+		cerr << "Warning: isBegin() not implemented" << endl;
+		return false;
+	}
+
+	virtual bool isEnd() const
+	{
+		cerr << "Warning:  isEnd() not implemented" << endl;
+		return false;
+	}
+};
+
+#endif // __FREESTYLE_ITERATOR_H__